/*
 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
 * Released under the terms of the GNU GPL v2.0.
 */

#ifndef EXPR_H
#define EXPR_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stdio.h>
#ifndef __cplusplus
#include <stdbool.h>
#endif

struct file {
    struct file *next;
    struct file *parent;
    char *name;
    int lineno;
    int flags;
};

#define FILE_BUSY 0x0001
#define FILE_SCANNED 0x0002

typedef enum tristate { no, mod, yes } tristate;

enum expr_type { E_NONE, E_OR, E_AND, E_NOT, E_EQUAL, E_UNEQUAL, E_LIST, E_SYMBOL, E_RANGE };

union expr_data {
    struct expr *expr;
    struct symbol *sym;
};

struct expr {
    enum expr_type type;
    union expr_data left, right;
};

#define EXPR_OR(dep1, dep2) (((dep1) > (dep2)) ? (dep1) : (dep2))
#define EXPR_AND(dep1, dep2) (((dep1) < (dep2)) ? (dep1) : (dep2))
#define EXPR_NOT(dep) (2 - (dep))

#define expr_list_for_each_sym(l, e, s) for (e = (l); e && (s = e->right.sym); e = e->left.expr)

struct expr_value {
    struct expr *expr;
    tristate tri;
};

struct symbol_value {
    void *val;
    tristate tri;
};

enum symbol_type { S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING, S_OTHER };

/* enum values are used as index to symbol.def[] */
enum {
    S_DEF_USER, /* main user value */
    S_DEF_AUTO, /* values read from auto.conf */
    S_DEF_DEF3, /* Reserved for UI usage */
    S_DEF_DEF4, /* Reserved for UI usage */
    S_DEF_COUNT
};

struct symbol {
    struct symbol *next;
    char *name;
    enum symbol_type type;
    struct symbol_value curr;
    struct symbol_value def[S_DEF_COUNT];
    tristate visible;
    int flags;
    struct property *prop;
    struct expr_value rev_dep;
};

#define for_all_symbols(i, sym)                          \
    for (i = 0; i < 257; i++)                            \
        for (sym = symbol_hash[i]; sym; sym = sym->next) \
            if (sym->type != S_OTHER)

#define SYMBOL_CONST 0x0001     /* symbol is const */
#define SYMBOL_CHECK 0x0008     /* used during dependency checking */
#define SYMBOL_CHOICE 0x0010    /* start of a choice block (null name) */
#define SYMBOL_CHOICEVAL 0x0020 /* used as a value in a choice block */
#define SYMBOL_VALID 0x0080     /* set when symbol.curr is calculated */
#define SYMBOL_OPTIONAL 0x0100  /* choice is optional - values can be 'n' */
#define SYMBOL_WRITE 0x0200     /* ? */
#define SYMBOL_CHANGED 0x0400   /* ? */
#define SYMBOL_AUTO 0x1000      /* value from environment variable */
#define SYMBOL_CHECKED 0x2000   /* used during dependency checking */
#define SYMBOL_WARNED 0x8000    /* warning has been issued */

/* Set when symbol.def[] is used */
#define SYMBOL_DEF 0x10000      /* First bit of SYMBOL_DEF */
#define SYMBOL_DEF_USER 0x10000 /* symbol.def[S_DEF_USER] is valid */
#define SYMBOL_DEF_AUTO 0x20000 /* symbol.def[S_DEF_AUTO] is valid */
#define SYMBOL_DEF3 0x40000     /* symbol.def[S_DEF_3] is valid */
#define SYMBOL_DEF4 0x80000     /* symbol.def[S_DEF_4] is valid */

#define SYMBOL_MAXLENGTH 256
#define SYMBOL_HASHSIZE 257
#define SYMBOL_HASHMASK 0xff

/* A property represent the config options that can be associated
 * with a config "symbol".
 * Sample:
 * config FOO
 *         default y
 *         prompt "foo prompt"
 *         select BAR
 * config BAZ
 *         int "BAZ Value"
 *         range 1..255
 */
enum prop_type {
    P_UNKNOWN,
    P_PROMPT,  /* prompt "foo prompt" or "BAZ Value" */
    P_COMMENT, /* text associated with a comment */
    P_MENU,    /* prompt associated with a menuconfig option */
    P_DEFAULT, /* default y */
    P_CHOICE,  /* choice value */
    P_SELECT,  /* select BAR */
    P_RANGE,   /* range 7..100 (for a symbol) */
    P_ENV,     /* value from environment variable */
};

struct property {
    struct property *next; /* next property - null if last */
    struct symbol *sym;    /* the symbol for which the property is associated */
    enum prop_type type;   /* type of property */
    const char *text;      /* the prompt value - P_PROMPT, P_MENU, P_COMMENT */
    struct expr_value visible;
    struct expr *expr; /* the optional conditional part of the property */
    struct menu *menu; /* the menu the property are associated with
                        * valid for: P_SELECT, P_RANGE, P_CHOICE,
                        * P_PROMPT, P_DEFAULT, P_MENU, P_COMMENT */
    struct file *file; /* what file was this property defined */
    int lineno;        /* what lineno was this property defined */
};

#define for_all_properties(sym, st, tok)    \
    for (st = sym->prop; st; st = st->next) \
        if (st->type == (tok))
#define for_all_defaults(sym, st) for_all_properties(sym, st, P_DEFAULT)
#define for_all_choices(sym, st) for_all_properties(sym, st, P_CHOICE)
#define for_all_prompts(sym, st)            \
    for (st = sym->prop; st; st = st->next) \
        if (st->text)

struct menu {
    struct menu *next;
    struct menu *parent;
    struct menu *list;
    struct symbol *sym;
    struct property *prompt;
    struct expr *dep;
    unsigned int flags;
    char *help;
    struct file *file;
    int lineno;
    void *data;
};

#define MENU_CHANGED 0x0001
#define MENU_ROOT 0x0002

#ifndef SWIG

extern struct file *file_list;
extern struct file *current_file;
struct file *lookup_file(const char *name);

extern struct symbol symbol_yes, symbol_no, symbol_mod;
extern struct symbol *modules_sym;
extern struct symbol *sym_defconfig_list;
extern int cdebug;
struct expr *expr_alloc_symbol(struct symbol *sym);
struct expr *expr_alloc_one(enum expr_type type, struct expr *ce);
struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2);
struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2);
struct expr *expr_alloc_and(struct expr *e1, struct expr *e2);
struct expr *expr_alloc_or(struct expr *e1, struct expr *e2);
struct expr *expr_copy(struct expr *org);
void expr_free(struct expr *e);
int expr_eq(struct expr *e1, struct expr *e2);
void expr_eliminate_eq(struct expr **ep1, struct expr **ep2);
tristate expr_calc_value(struct expr *e);
struct expr *expr_eliminate_yn(struct expr *e);
struct expr *expr_trans_bool(struct expr *e);
struct expr *expr_eliminate_dups(struct expr *e);
struct expr *expr_transform(struct expr *e);
int expr_contains_symbol(struct expr *dep, struct symbol *sym);
bool expr_depends_symbol(struct expr *dep, struct symbol *sym);
struct expr *expr_extract_eq_and(struct expr **ep1, struct expr **ep2);
struct expr *expr_extract_eq_or(struct expr **ep1, struct expr **ep2);
void expr_extract_eq(enum expr_type type, struct expr **ep, struct expr **ep1, struct expr **ep2);
struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym);

void expr_fprint(struct expr *e, FILE *out);
struct gstr; /* forward */
void expr_gstr_print(struct expr *e, struct gstr *gs);

static inline int expr_is_yes(struct expr *e) {
    return !e || (e->type == E_SYMBOL && e->left.sym == &symbol_yes);
}

static inline int expr_is_no(struct expr *e) {
    return e && (e->type == E_SYMBOL && e->left.sym == &symbol_no);
}
#endif

#ifdef __cplusplus
}
#endif

#endif /* EXPR_H */
